The biggest unmotivator, in my experience, is low expectations. People don't ask enough from themselves and the life they lead.
Life evolves when you set higher aspirations for yourself. In the field of motivation, the highest level is inspiration, the best motivator of all. When people are inspired, they are willing to undergo trials, setbacks, and discomforts because they have such a strong belief in what they're doing. Whatever you might think of religious missionaries, Arctic explorers, and sailors who cross the Atlantic single-handedly, their aspiration gives them endurance, courage, and the ability to overcome hardships.
-- Deepak Chopra
